Understanding human limitations in discriminating self-motion heading directions can contribute to the design of better steering interfaces. This study investigated whether a previously reported vestibular over-weighting phenomenon still exist when participants were exposed to weak (near perception threshold) visual motion and inertial motion. A previous theory predicted that such phenomena should not exist but our preliminary results indicate they do. This discrepancy can be explained by a known suppression of cortical visual response during inertial motion. Potential applications include assessing and predicting the heading discrimination ability of a driver, who remotely controls a vehicle from another moving platform.
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